Adding code

1 files changed, 15 insertions, 0 deletions

diff --git a/include/09.paging/paging04.c b/include/09.paging/paging04.c
new file mode 100644
index 0000000..ad7507f
--- /dev/null
+++ b/include/09.paging/paging04.c
@@ -0,0 +1,15 @@
+void set_pt(size_t num,uint32_t address)
+{
+    // holds the physical address where we want to start mapping these pages to.
+    // in this case, we want to map these pages to the very beginning of memory.
+    //we will fill all 1024 entries in the table, mapping 4 megabytes
+    for(size_t i=0;i<1024;i++)
+    {
+	// As the address is page aligned, it will always leave 12 bits zeroed.
+	// Those bits are used by the attributes ;)
+	page_table[num][i] = (address + i * 0x1000) | 3; // attributes: supervisor level, read/write, present.
+    }
+
+    page_directory[num] = ((uint32_t)page_table[num]) | 3;
+    // attributes: supervisor level, read/write, present
+}